diff --git a/src/industry_cmd.cpp b/src/industry_cmd.cpp
index 9d5d761639..9039c8c60f 100644
--- a/src/industry_cmd.cpp
+++ b/src/industry_cmd.cpp
@@ -136,7 +136,7 @@ const IndustrySpec *GetIndustrySpec(IndustryType thistype)
  */
 const IndustryTileSpec *GetIndustryTileSpec(IndustryGfx gfx)
 {
-	assert(gfx < INVALID_INDUSTRYTILE);
+	assert(gfx < NUM_INDUSTRYTILES);
 	return &_industry_tile_specs[gfx];
 }
 
diff --git a/src/industrytype.h b/src/industrytype.h
index 15307bc615..5421a0bcb6 100644
--- a/src/industrytype.h
+++ b/src/industrytype.h
@@ -194,7 +194,7 @@ inline IndustryGfx GetTranslatedIndustryTileID(IndustryGfx gfx)
 	 * will never be assigned as a tile index and is only required in order to do some
 	 * tests while building the industry (as in WATER REQUIRED */
 	if (gfx != 0xFF) {
-		assert(gfx < INVALID_INDUSTRYTILE);
+		assert(gfx < NUM_INDUSTRYTILES);
 		const IndustryTileSpec *it = &_industry_tile_specs[gfx];
 		return it->grf_prop.override == INVALID_INDUSTRYTILE ? gfx : it->grf_prop.override;
 	} else {